Malicious PDF — malware analysis report

Static analysis result for SHA-256 152aa5f54abaf916…

MALICIOUS

PDF

48.5 KB Created: 2020-03-30 04:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 237d39a06e6854a91fb0fa96c5b41e61 SHA-1: f7cca17ca98f396b14b76328be9438b3792c5760 SHA-256: 152aa5f54abaf9169a19124d22bbe8ce88397453d9614eebac92d89038c97af6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The primary URL, http://juliejesternewman.com/uploads/1/3/1/3/131384260/131384260.html#charolas+para+meseros+en+monterrey, is presented as the document's content, likely to attract search engine traffic. The ML classifier strongly indicated maliciousness, and the sheer volume of outbound links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://juliejesternewman.com/uploads/1/3/1/3/131384260/131384260.html#charolas+para+meseros+en+monterrey
    • http://concerttypething.com/uploads/1/3/0/6/130621596/2157e.pdf
    • http://leahnpp.com/uploads/1/3/0/4/130491418/xibul.pdf
    • http://elmoshade.com/uploads/1/3/0/6/130621406/2959709e54f80.pdf
    • http://best-edu-online.com/uploads/1/3/0/8/130874413/6296991.pdf
    • http://219perch.com/uploads/1/3/0/7/130775451/zoredatefawi_pavolenuxesewox_vixejag_kaguda.pdf
    • http://cplions.com/uploads/1/3/0/3/130313671/xamidogedikatenuwu.pdf
    • http://homeeducationcreations.com/uploads/1/3/0/6/130604716/88ea1853c93.pdf
    • http://ccar-recoverycoach.com/uploads/1/3/0/5/130590538/5871301.pdf
    • http://michaelsilveyiptec.com/uploads/1/3/0/5/130588951/9462052.pdf
    • http://markholtschlag.com/uploads/1/3/0/5/130588258/d8b27c35491.pdf
    • http://cci-forum.com/uploads/1/3/1/4/131408298/naxub.pdf
    • http://webdisk.canecorsocarolinas.org/uploads/1/3/0/2/130291766/punimegamez.pdf
    • http://adamplunkett.com/uploads/1/3/0/4/130436173/b4b8120018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070c4.bin
a151287eaa6fe24a3938295f3c8584bf9206863084de0c9238d6e8c2b28e3710
pdf-font-stream PDF embedded font (sfnt) at offset 0x70C4 10620 bytes
font_01_sfnt_off0000960c.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04
pdf-font-stream PDF embedded font (sfnt) at offset 0x960C 2616 bytes
font_02_sfnt_off00009f40.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F40 16036 bytes